public class Numbers 
{
   /**
      Produces a string containing the numbers in an array,
      separated by commas, such as "1,4,9"
      @param values an array of integer values
      @return a string containing the array elements, separated by
      commas.
    */
   public String separateWithCommas(int[] values)
   {
      // your work here
      String L = "";
      if(values.length != 0){
         L = String.valueOf(values[0]);
         for(int i=1;i<values.length;i++){
            L+=","+String.valueOf(values[i]);
         }
      }
      return L;
      
   }
}